RDMA/mana_ib: create/destroy AH

Implement create and destroy AH for kernel.

In mana_ib, AV is passed as an sge in WQE.
Allocate DMA memory and write an AV there.

Signed-off-by: Konstantin Taranov <kotaranov@microsoft.com>
Link: https://patch.msgid.link/1737394039-28772-8-git-send-email-kotaranov@linux.microsoft.com
Reviewed-by: Shiraz Saleem <shirazsaleem@microsoft.com>
Reviewed-by: Long Li <longli@microsoft.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

1 files changed, 58 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mana/ah.c b/drivers/infiniband/hw/mana/ah.c
new file mode 100644
index 000000000000..f56952eebbaa
--- /dev/null
+++ b/drivers/infiniband/hw/mana/ah.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2024, Microsoft Corporation. All rights reserved.
+ */
+
+#include "mana_ib.h"
+
+int mana_ib_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *attr,
+		      struct ib_udata *udata)
+{
+	struct mana_ib_dev *mdev = container_of(ibah->device, struct mana_ib_dev, ib_dev);
+	struct mana_ib_ah *ah = container_of(ibah, struct mana_ib_ah, ibah);
+	struct rdma_ah_attr *ah_attr = attr->ah_attr;
+	const struct ib_global_route *grh;
+	enum rdma_network_type ntype;
+
+	if (ah_attr->type != RDMA_AH_ATTR_TYPE_ROCE ||
+	    !(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
+		return -EINVAL;
+
+	if (udata)
+		return -EINVAL;
+
+	ah->av = dma_pool_zalloc(mdev->av_pool, GFP_ATOMIC, &ah->dma_handle);
+	if (!ah->av)
+		return -ENOMEM;
+
+	grh = rdma_ah_read_grh(ah_attr);
+	ntype = rdma_gid_attr_network_type(grh->sgid_attr);
+
+	copy_in_reverse(ah->av->dest_mac, ah_attr->roce.dmac, ETH_ALEN);
+	ah->av->udp_src_port = rdma_flow_label_to_udp_sport(grh->flow_label);
+	ah->av->hop_limit = grh->hop_limit;
+	ah->av->dscp = (grh->traffic_class >> 2) & 0x3f;
+	ah->av->is_ipv6 = (ntype == RDMA_NETWORK_IPV6);
+
+	if (ah->av->is_ipv6) {
+		copy_in_reverse(ah->av->dest_ip, grh->dgid.raw, 16);
+		copy_in_reverse(ah->av->src_ip, grh->sgid_attr->gid.raw, 16);
+	} else {
+		ah->av->dest_ip[10] = 0xFF;
+		ah->av->dest_ip[11] = 0xFF;
+		copy_in_reverse(&ah->av->dest_ip[12], &grh->dgid.raw[12], 4);
+		copy_in_reverse(&ah->av->src_ip[12], &grh->sgid_attr->gid.raw[12], 4);
+	}
+
+	return 0;
+}
+
+int mana_ib_destroy_ah(struct ib_ah *ibah, u32 flags)
+{
+	struct mana_ib_dev *mdev = container_of(ibah->device, struct mana_ib_dev, ib_dev);
+	struct mana_ib_ah *ah = container_of(ibah, struct mana_ib_ah, ibah);
+
+	dma_pool_free(mdev->av_pool, ah->av, ah->dma_handle);
+
+	return 0;
+}